Profiled Leg Elastic Application via Axial Translation Pucks
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Solution Overview
Problem
Existing techniques for applying leg elastics to absorbent garments, such as diapers, often result in straight or relatively straight elastics due to limitations in achieving significant curvature at high line speeds, which affects leakage performance and aesthetic appearance.
Innovation Solution
An apparatus comprising transfer puck assemblies, a drive assembly, and a translation mechanism that rotates and axially translates puck segments to profile discrete parts, allowing for the application of curved leg elastics to a moving web, enabling the creation of absorbent articles with improved leakage protection and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If known techniques are used to apply leg elastics to a moving web at high line speeds, then productivity is maintained, but the leg elastics remain straight or relatively straight with limited displacement
Solution Approach 1:
The transfer puck assembly is made dynamically adjustable, allowing the puck to shift its position axially during rotation. This dynamic adjustment enables the puck to impart curvature to the leg elastic while maintaining synchronization with the web movement, resolving the contradiction between maintaining high line speed and achieving curved profiles.
Solution Approach 2:
The invention introduces axial translation of the puck segment in addition to the rotational movement. By adding this axial dimension of movement, the system can create curvature in the leg elastic without reducing the tangential speed at which the web moves, thus maintaining productivity while improving shape.
2Shape
If known techniques are used to apply leg elastics with significant displacement, then shape quality improves, but the process becomes unsatisfactory at high line speeds
Solution Approach 1:
The transfer puck assembly dynamically adjusts its axial position during rotation to create the desired curvature. This dynamic capability allows significant displacement to be achieved at any point in the rotation cycle, maintaining shape quality regardless of the web's line speed.
Solution Approach 2:
The puck segment is positioned and adjusted in advance during the rotation cycle to impart curvature to the leg elastic before it is applied to the web. This preliminary shaping action ensures that the desired displacement is achieved without compromising the speed at which the web moves.
3Shape
If the transfer puck assembly is made dynamically adjustable with axial translation capability, then the ability to create profiled leg elastics improves, but device complexity increases
Solution Approach 1:
The axial translation capability is integrated into the existing rotational transfer puck assembly structure. By merging these two movements into a single coordinated mechanism, the invention achieves profiled leg elastics without requiring completely separate systems, thus limiting the increase in device complexity.
Solution Approach 2:
The transfer puck assembly serves multiple functions: it transfers the leg elastic to the web, creates the desired curvature through axial translation, and maintains synchronization with the web movement. This multi-functionality reduces the need for additional separate mechanisms, thereby limiting the increase in device complexity.
Data Source
AI summary
An apparatus for conveying and applying a discrete part to a substrate includes a plurality of transfer puck assemblies, a drive assembly, and a translation mechanism. The plurality of transfer puck assemblies is adapted to convey the discrete part to the substrate, and each transfer puck assembly includes at least one puck segment. The drive assembly is configured to rotate each transfer puck assembly about a drive axis. The translation mechanism is configured to translate the at least one puck segment in an axial direction as the plurality of transfer puck assemblies are being rotated about the drive axis to move the discrete part to a profiled configuration prior to application of the profiled discrete part to the substrate.